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1. Custom terahertz waveforms using complementary organic nonlinear optical crystals

   https://doi.org/10.1364/OL.474343  

   Rader, Claire; Nielson, Megan_F; Knighton, Brittany_E; Zaccardi, Zachary_B; Michaelis, David_J; Johnson, Jeremy_A (November 2022, Optics Letters)

   Organic nonlinear optical (NLO) crystals are among the most efficient (>1%) terahertz (THz) radiation generators. However, one of the limitations of using organic NLO crystals is that the unique THz absorptions in each crystal make it difficult to obtain a strong, smooth, and broad emission spectrum. In this work, we combine THz pulses from two complementary crystals, DAST and PNPA, to effectively fill in spectral gaps, creating a smooth spectrum with frequencies out to 5 THz. The combination of pulses also increases the peak-to-peak field strength from 1 MV/cm to 1.9 MV/cm. 

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2. Intense THz Generation with New Organic NLO Crystal NMBA

   https://doi.org/10.1002/adom.202302402  

   Ludlow, Daisy JH; Palmer, Bruce_Wayne H; Green, Natalie K; Ho, Sin‐Hang Enoch; Wayment, Coriantumr Z; Kelleher, Brenan M; Barlow, Connor D; Rollans, Olivia N; Hunter, Brittan P; Rader, Claire; et al (January 2024, Advanced Optical Materials)

   Abstract Large crystal growth and characterization of the optical and terahertz (THz) properties of organic nonlinear optical (NLO) crystal NMBA (4‐Nitro‐4′‐methylbenzylidene aniline) is presented. The reported method of crystal growth consistently produces high‐quality single crystals. The THz generation efficiency and optical properties of NMBA to other THz generation crystals including BNA and MNA are compared. The low THz absorptions that make NMBA an ideal source for THz time‐domain spectroscopy are highlighted. 

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3. Layered Terahertz Crystal Structures for Improved Terahertz Output

   https://doi.org/10.1364/FIO.2022.JW5B.16  

   Ludlow, Daisy J.; Alejandro, Aldair; Petersen, Paige K.; Green, Natalie K.; Holland, Kayla M.; N’diaye, Fatoumata; Manwaring, Tanner; Michaelis, David J.; Johnson, Jeremy A. (January 2022, Frontiers in Optics + Laser Science 2022)

   We have improved the THz output and damage threshold of yellow organic THz generation crystals by fusing them to sapphire and using liquid crystals as index matching fluid to reduce reflective losses. 

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4. Efficient Broadband THz Generation from New Standards in Optical Rectification

   https://doi.org/10.1364/CLEO_AT.2023.JTh2A.115  

   Green, Natalie K.; Palmer, Bruce Wayne; Rader, Claire; Ho, Sin-Hang Enoch; Zaccardi, Zachary B.; Ludlow, Daisy J.; Lutz, Matthew J.; Alejandro, Aldair; Nielson, Megan F.; Valdivia-Berroeta, Gabriel A.; et al (January 2023, CLEO 2023)

   We present the optical and THz properties of highly efficient organic nonlinear optical crystals PNPA and MNA. These crystals outperform industry standards in broadband THz generation through optical rectification of IR light pulses. 

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5. Optical Rectification from Next Generation Organic THz Generation Crystals

   https://doi.org/10.1364/FIO.2022.JW5B.22  

   Green, Natalie K.; Palmer, Bruce Wayne; Rader, Claire; Ho,; Zaccardi, Zac; Ludlow, Daisy J.; Lutz, Matthew J.; Alejandro, Aldair; Nielson, Megan F.; Valdivia-Berroeta, Gabriel A.; et al (January 2022, Frontiers in Optics + Laser Science 2022)

   We recently developed new organic nonlinear optical crystals for THz generation. We report the optical and THz properties of PNPA and MNA and discuss how they pave the way for the future of THz spectroscopy. 

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